常见的齿轮逐齿中频淬火方法有三种,即单齿同时加热淬火、沿一齿两侧面连续淬火和沿齿沟连续淬火(表1)。前两种方法淬火的硬化层终止于齿根,造成应力集中,同时淬火在齿根产生附加拉应力,从而大大降低了抗交变载荷能力和弯曲疲劳强度,常导致齿根裂纹和折断。沿齿根连续淬火,能在齿面和齿谷得到连续均匀分布的硬化层,从而有效地提高了弯曲疲劳强度和使用寿命 There are three common methods of gear-to-tooth IF quenching: single-tooth simultaneous heating and quenching, continuous quenching along both sides of one tooth, and continuous quenching along the tooth groove (Table 1). The first two methods quench the hardened layer terminating in the root, causing stress concentration, while quenching in the tooth root to produce additional tensile stress, thus greatly reducing the resistance to alternating load capacity and bending fatigue strength, often lead to root cracking and fracture. Continuous along the tooth root quenching, in the tooth surface and tooth valley to obtain a continuous uniform distribution of the hardened layer, which effectively improves the bending fatigue strength and service life